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I had the HPP3 in my 2000 GMC Sierra Z71 5.3l 3.73 gear pickup
My settings were set below with no issues for about 100K miles
- Stock Thermostat
- 93 Octane (later switched to 87 octane and felt no difference)
- Shift Firmness
- Top Speed: 110 MPH
- Rev Limiter: 6200
- 1-2 +4
- 2-3 +7
- 3-4 +5
I sold it on ebay and went with a custom tuned PCM from www.wait4meperformance.com - better bang for your buck![]()







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